Flashcards in B2 Biology - Stem cells and differentiation Deck (18)
what does undifferentiated mean? and what are they called?
cells can develop in to different types of cells
they are called stem cells
where are stem cells found in humans?
how are scientists trying to get one specific type of stem cell?
by changing the environment they're growing in
why do some people think stem cell research is a bad thing?
- people believe that you are killing something with the potential to grow into human life
- unwanted cells are destroyed
-its just purely unethical
what is the 23rd pair of chromosomes labelled?
XX and XY
what do they mean?
XY = MALE
XX = FEMALE
what are genetic diagrams?
they help you find the possibility of getting a boy or a girl
how could stem cells be used to treat disorders?
the cells can turn into new blood cells or replace faulty cells within the body
who was Gregor Mendel? what did he show?
a monk who studied in maths and natural history
he showed that characteristcs in plants are passed on to the next generation
what are the two hereditary units?
dominant and recessive
what are alleles?
different versions of the same gene
what does homozygous mean?
organism with two alleles for a particular gene
what does heterozygous mean?
two alleles for the same gene are different
is cystic fibrosis caused by recessive or dominant allele?
is polydactyly caused by R or D allele?
what chance do babies have of getting CF if their parents are both carriers?
1 in 4 chance
why is embryo screening seen as a bad thing?
- can choose what your baby looks like, unethical
-rejected embryos are destroyed
-screening is expensive